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An electronic lock includes two covers respectively formed on an outside and inside of a door, a tumbler slidably moving in a tumbler hole formed in a central transmission shaft secured to an outside door knob and moving in a tumbler socket formed in a sleeve engageable with the central shaft and se

An electronic lock includes two covers respectively formed on an outside and inside of a door, a tumbler slidably moving in a tumbler hole formed in a central transmission shaft secured to an outside door knob and moving in a tumbler socket formed in a sleeve engageable with the central shaft and secured to an inside knob, in which the tumbler is operated, by the action of a magnet manually swung or by an electromagnetic coil which is powered by a sensor when sensing a correct coded number card inserted in the sensor, to couple the central transmission shaft with the sleeve coupled to a dead latch so that upon a rotation of the outside knob to rotate the central shaft, the sleeve will be rotated to retract the dead latch for opening the door.

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A control mechanism of electronic lock comprising: an outside cover fixed on an outside surface of a door having an outside knob rotatably mounted in said outside cover and a sensor fixed on an inside surface of the outside cover operatively reading a coded number card inserted through a slot formed

A control mechanism of electronic lock comprising: an outside cover fixed on an outside surface of a door having an outside knob rotatably mounted in said outside cover and a sensor fixed on an inside surface of the outside cover operatively reading a coded number card inserted through a slot formed in said outside cover; an inside cover projectively aligned to said outside cover fixed on an inside surface of the door having an inside knob rotatably mounted in said inside cover; a base secured between said outside cover and said inside cover and fixed on an inside surface of the door having a battery socket for storing batteries therein for powering said sensor; a control means including a first sleeve rotatably mounted in said base having an inner end portion of said first sleeve secured to said inside knob and having an outer end portion of said first sleeve normally coupled with a second sleeve, a central transmission shaft having an inner end portion of said transmission shaft rotatably held in said first sleeve and having an outer end portion of said transmission shaft secured to said outside knob, a tumbler set operatively coupling said first sleeve and said central transmission shaft, an electromagnetic coil fixed on said base under said first sleeve for coupling said first sleeve and said central transmission shaft when powered by said batteries as sensed by said sensor, and a magnetic actuator having a magnet and pivotally secured on said base having a thumbturn connected with said magnetic actuator pivotally mounted on said inside cover for operatively coupling said first sleeve with said central transmission shaft; a dead latch means having a latch normally extending sidewardly for closing the door and a collar engaged with said second sleeve of said control means, said collar operatively retracting said latch for opening the door when rotating said first sleeve and said second sleeve; said first sleeve rotatably mounted in between a base and a covering plate secured to said base including a square shaft formed on an inner end of said first sleeve fixed to the inside knob, a transmission cylinder formed on an outer end of said first sleeve having a plurality of notches formed in said cylinder, a cylindrical recess recessed in said transmission cylinder, an upper tumbler socket radially vertically formed in an upper portion in said cylindrical recess, and a lower tumbler socket radially vertically formed in a lower portion of said cylindrical recess under said upper tumbler socket, a pin hole formed in a bottom portion of said first sleeve communicated with said lower tumbler socket; the improvement which comprises: said central transmission shaft including a cylindrical head formed on an inner end of said transmission shaft rotatably engageable in said cylindrical recess of said first sleeve having an upper tumbler hole formed in an upper portion of said cylindrical head operatively matching with said upper tumbler socket of said first sleeve and a lower tumbler hole formed in a lower portion of said cylindrical head operatively matching with said lower tumbler socket of said first sleeve, and a square shaft portion formed on an outer end of said transmission shaft to be secured to said outside knob, whereby upon a sensing of said sensor by a correct coded number card, said electromagnetic coil is powered for actuating said tumbler set for coupling said first sleeve and said central transmission shaft so that said outside knob can be rotated to rotate said central transmission shaft, said first and second sleeves to retract said latch of said dead latch means for opening the door, or upon a swinging of said magnetic actuator to approach said tumbler set allowing said tumbler set to couple said first sleeve and said central transmission shaft, the outside knob can be rotated for opening the door.